Stairway



May 12, 1959v D..TORRlCELLl 2,885,883

' STAIRWAY Filed March 27, 1958 2 Sheets-Sheet 1 I 1 7 I I 44 Z Z /z 4 4/ j 12 I 4 g BY 7 m7 May 12, 1959 H o. TORRICELLI 2,885,883 I STAIRWAY Filed March 27, 1958 2 Sheets-Sheet 2 @1 2 INVENTOR United States Patent STAIRWAY Decio Torricelli, Springfield, Mass.

Application March 27, 1958, Serial No. 724,412

1 Claim. (Cl. 72-96) This invention relates to new and useful improvements in a flight of steps assembled from preformed components.

The principal objects of the invention are directed to the provision of preformed components for a flight of steps which are arranged for interlocking engagement in assembled relation.

According to novel features of the invention, the components are preformed in such manner that they are readily and easily assembled on the job site, and are so constructed and arranged as to interlock with one another to provide a unitary, self supporting, strong and rugged step structure.

Various changes and modifications may be made in the form of the components without departing from the spirit and scope of the invention to be described in the present preferred form thereof, in connection with the accompanying drawings wherein:

Fig. 1 is a side elevational view of a flight of steps embodying the novel features of the invention;

Fig. 2 is a front elevational view of the steps shown in Fig. 1;

Fig. 3 is a rear elevational view of the steps shown in Figs. 1 and 2;

Fig. 4 is a sectional view of the steps shown in Figs. 1 and 2;

Fig. 4A is a perspective view of the end portions of an intermediate riser and tread to illustrate the interlocking features thereof;

Fig. 5 is a side elevational view of one of the stringers or side plates of the stair structure;

Fig. 6 is a perspective view of one end of the front supporting plate for the stringers;

Fig. 7 is a perspective view of one end of the first riser of the structure;

Fig. 8 is a perspective view of one end of a tread of the structure and looking at the lower side thereof;

Fig. 9 is a perspective view of one end of an intermediate riser of the structure;

Fig. 10 is a perspective view of the platform of the structure looking at the underside thereof;

Fig. 11 is a perspective view of the rear supporting plate for the stringers; and

Fig. 12 is a perspective view of one of the cross braces of the structure.

Referring now to the drawings more in. detail, the novel features of the invention will be described in detail.

The stair structure in a general way includes, as in Figs. 1 and 2, vertical stringers or side plates such as 2, front and rear supporting plates 4 and 6 respectively, front riser 8, treads 10, intermediate risers 12, platform 14, and braces 16.

The front supporting plate 4, shown in Fig. 6, is provided with grooves 20 on its upper side, at opposite ends thereof, to receive the bottom forward edges of the stringers or side plates 2, and has a longitudinal ledge 22 along the front side thereof on which-the first riser 8 rests.

The first riser, as in Fig. 7, is provided on its rear face with grooves 24 adjacentitsopposite ends to receive lower .front edges 26 of the stringers 2 with said first riser. disposed on the ledge 22 of the from supporting plate 4.

The intermediate risers 12, as shown in Fig. 9, have grooves 28 on rear faces, and adjcent the opposite ends thereof to receive front edges 30 of the stringers 2. Depending portions 30 of these risers are provided with longitudinal grooves 34 on front faces thereof with lips or ledges 36 therebelow. The grooves 34 receive rear edge portions of the treads 10.

The treads 10, as shown in Fig. 8, are provided with longitudinal grooves 38 along the underside thereof, adjacent their front edges 40, and with connecting grooves 42 inwardly of opposite ends thereof. I

With the lowermost tread 10 in horizontal position, the upper edge of the first riser is disposed in the groove 38 of said tread, and the upper edge portions 46 of the stringers 2 are disposed in the end grooves 42 of said tread.

Inner longitudinal edge portions 10' of the tread 10 are received in the groove 34 of the intermediate or second riser 12 so that the main body of said riser rests on the rear edge of said tread. The edge portions 30 of the stringers 2 are received in the grooves 28 of the riser.

The treads 10 are held against forward movement by the upper edge of the riser below in the groove 38 thereof. Sidewise displacement of the tread is prevented by the edge portions 46 of the stringers 2 in the grooves 42 of the tread. The risers are held against displacement by the tread rear portions 10 of the treads 10 in the groove 34 thereof, and edge portions 30 of the stringers in the grooves 28 thereof.

The treads, risers and stringers are interlocked, as described, to provide a rigid and strong structure.

The platform 14, shown in Fig. 10, is provided on its bottom side with an elongated groove 48 adjacent its front edge 50 to receive the upper edge of the uppermost riser 12. Also, on its underside, said platform, inwardly of its opposite sides, is provided with grooves 52 to receive the uppermost edges 54 of the stringers 2.

The rear supporting plate 6, shown in Fig. 11, is provided on its upper side with grooves 56 in which rear portions of the lower edges of the stringers 2 are received. Also, said plate 6 is provided with notches 58 to receive lower ends of the braces 16.

Inner sides of the stringers 2, adjacent upper edges thereof, are provided with notches 60, shown in Fig. 5, which receive upper ends of elongated braces 16, which are elongated members, as shown in Fig. 12.

The components will be preformed as by casting with concrete or other suitable material, and said components may be reinforced by such suitable material and in a manner, as may be desired.

The various grooves may have relatively diverging sides and it is contemplated that tolerances of the components will be such as to facilitate ready and easy assembly thereof. Tolerances will allow for plumbing and levelling of each component so that the assembled structure will be plumb and level in all respects.

Various changes and modifications may be made within the spirit and scope of the invention, and it is preferred to be limited,'if at all, by the appended claim, rather than by the foregoing description of the present preferred form of the invention.

I claim:

A flight of steps comprising, precast concrete front and rear horizontal supporting plates, opposite vertical side plates, a front riser, vertical intermediate risers, horizontal treads, and an upper horizontal platform, said front aesaaes r3 and rear plates provided with longitudinally spaced grooves adjacent opposite ends to receive front and rear lower edges of said side plates in vertical position thereof and sa'i'cl front plate provided with ale'd'ge forwardly ofthe grooves therein "supporting-said front riser in vertie'al position, said side plates provided on the front edge thereof with alternate horizontal tread and vertical ri'se'r portions, said treads provided on the underside thereof with grooves adjacent opposite ends thereof receiving horizontal portions of said :side plates and with longitudinal grooves adjacent forward e'dges thereof receiving upper 'edges of rise'rs the'rebelow, said intermediate risers having body portions resting on-rear edge portions of treads therebelow and provided on rear sides thereof with grooves receiving vertical riserp'ortions of-said side plates, the body portions of said risers having portions depending therefrom intermediate said side plates terminating in supporting ledges extending forwardly therefrom and spaced downwardly from the main body por- References'Cited in therfile of this patent UNITED STATES PATENTS 4 1,386,251 Garza Aug. 2, 1921 1,893,876 Anderson Jan. 10, 1933 2,021,457 MacKenzie Nov. 19, 1935 2,515,823 Dettling July 18, 1950 FOREIGN PATENTS '614;465 Great Britain of 1948 

